We are studying a new kind of excitation ``soft multipole excitation"
in halo nuclei by Hartree-Fock+
random phase approximation. It is shown that the soft excitations
are enhanced their strength by threshold effect inherent in halo nuclei.

We are also studying the beta decay of neutron and proton drip line nuclei
and have found that they decay to the giant Gamow-Teller state due
to large difference between proton and neutron Fermi energies.